如何使Excel的功能包括暂停，而不需要使用Excel ?

I have an Excel "project" that includes a .dll where I have written some complex statistical calculations called through VBA. I have done that for speed reasons. The calculations take about a second each. Since they are called through VBA it stalls Excel for the duration of the calculations and that is acceptable. (The choice of Excel is not mine but a result of the way a third party has chosen to deliver data)I have an Excel "project" that includes a .dll